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Finding the Fourth Proportional to 611,863.40, 917,795.10 and 328,428.20

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Solution

The fourth proportional to 611,863.40, 917,795.10 and 328,428.20 is: 492,642.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,863.40 : 917,795.10 = 328,428.20 : x
  2. Step 2: Convert to fraction form
    611,863.40/917,795.10 = 328,428.20/x
  3. Step 3: Cross multiply
    611,863.40x = 917,795.10 × 328,428.20
  4. Step 4: Simplify right side
    611,863.40x = 301,429,792,661.82
  5. Step 5: Solve for x
    x = 301,429,792,661.82/611,863.40
  6. Step 6: Final answer
    x = 492,642.30

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.