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Finding the Fourth Proportional to 485,787.40, 728,681.10 and 434,611.60

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Solution

The fourth proportional to 485,787.40, 728,681.10 and 434,611.60 is: 651,917.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,787.40 : 728,681.10 = 434,611.60 : x
  2. Step 2: Convert to fraction form
    485,787.40/728,681.10 = 434,611.60/x
  3. Step 3: Cross multiply
    485,787.40x = 728,681.10 × 434,611.60
  4. Step 4: Simplify right side
    485,787.40x = 316,693,258,760.76
  5. Step 5: Solve for x
    x = 316,693,258,760.76/485,787.40
  6. Step 6: Final answer
    x = 651,917.40

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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.