Home / 645,461.20-890,747.90-358,981.42

Finding the Fourth Proportional to 645,461.20, 890,747.90 and 358,981.42

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Solution

The fourth proportional to 645,461.20, 890,747.90 and 358,981.42 is: 495,400.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,461.20 : 890,747.90 = 358,981.42 : x
  2. Step 2: Convert to fraction form
    645,461.20/890,747.90 = 358,981.42/x
  3. Step 3: Cross multiply
    645,461.20x = 890,747.90 × 358,981.42
  4. Step 4: Simplify right side
    645,461.20x = 319,761,946,004.02
  5. Step 5: Solve for x
    x = 319,761,946,004.02/645,461.20
  6. Step 6: Final answer
    x = 495,400.72

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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.