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Finding the Fourth Proportional to 456,743.40, 685,115.10 and 425,639.40

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Solution

The fourth proportional to 456,743.40, 685,115.10 and 425,639.40 is: 638,459.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    456,743.40 : 685,115.10 = 425,639.40 : x
  2. Step 2: Convert to fraction form
    456,743.40/685,115.10 = 425,639.40/x
  3. Step 3: Cross multiply
    456,743.40x = 685,115.10 × 425,639.40
  4. Step 4: Simplify right side
    456,743.40x = 291,611,980,094.94
  5. Step 5: Solve for x
    x = 291,611,980,094.94/456,743.40
  6. Step 6: Final answer
    x = 638,459.10

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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.