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Finding the Fourth Proportional to 645,274.86, 890,499.88 and 358,807.02

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Solution

The fourth proportional to 645,274.86, 890,499.88 and 358,807.02 is: 495,165.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,274.86 : 890,499.88 = 358,807.02 : x
  2. Step 2: Convert to fraction form
    645,274.86/890,499.88 = 358,807.02/x
  3. Step 3: Cross multiply
    645,274.86x = 890,499.88 × 358,807.02
  4. Step 4: Simplify right side
    645,274.86x = 319,517,608,253.16
  5. Step 5: Solve for x
    x = 319,517,608,253.16/645,274.86
  6. Step 6: Final answer
    x = 495,165.13

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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.