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Finding the Fourth Proportional to 611,476.40, 917,214.60 and 387,090.20

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Solution

The fourth proportional to 611,476.40, 917,214.60 and 387,090.20 is: 580,635.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,476.40 : 917,214.60 = 387,090.20 : x
  2. Step 2: Convert to fraction form
    611,476.40/917,214.60 = 387,090.20/x
  3. Step 3: Cross multiply
    611,476.40x = 917,214.60 × 387,090.20
  4. Step 4: Simplify right side
    611,476.40x = 355,044,782,956.92
  5. Step 5: Solve for x
    x = 355,044,782,956.92/611,476.40
  6. Step 6: Final answer
    x = 580,635.30

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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.