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Finding the Fourth Proportional to 645,432.16, 890,690.16 and 358,938.40

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Solution

The fourth proportional to 645,432.16, 890,690.16 and 358,938.40 is: 495,331.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,432.16 : 890,690.16 = 358,938.40 : x
  2. Step 2: Convert to fraction form
    645,432.16/890,690.16 = 358,938.40/x
  3. Step 3: Cross multiply
    645,432.16x = 890,690.16 × 358,938.40
  4. Step 4: Simplify right side
    645,432.16x = 319,702,900,926.14
  5. Step 5: Solve for x
    x = 319,702,900,926.14/645,432.16
  6. Step 6: Final answer
    x = 495,331.53

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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.