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Finding the Fourth Proportional to 645,157.71, 890,219.96 and 369,472.69

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Solution

The fourth proportional to 645,157.71, 890,219.96 and 369,472.69 is: 509,816.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,157.71 : 890,219.96 = 369,472.69 : x
  2. Step 2: Convert to fraction form
    645,157.71/890,219.96 = 369,472.69/x
  3. Step 3: Cross multiply
    645,157.71x = 890,219.96 × 369,472.69
  4. Step 4: Simplify right side
    645,157.71x = 328,911,963,312.89
  5. Step 5: Solve for x
    x = 328,911,963,312.89/645,157.71
  6. Step 6: Final answer
    x = 509,816.38

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.