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Finding the Fourth Proportional to 645,693.88, 891,069.52 and 359,240.62

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Solution

The fourth proportional to 645,693.88, 891,069.52 and 359,240.62 is: 495,758.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,693.88 : 891,069.52 = 359,240.62 : x
  2. Step 2: Convert to fraction form
    645,693.88/891,069.52 = 359,240.62/x
  3. Step 3: Cross multiply
    645,693.88x = 891,069.52 × 359,240.62
  4. Step 4: Simplify right side
    645,693.88x = 320,108,366,827.90
  5. Step 5: Solve for x
    x = 320,108,366,827.90/645,693.88
  6. Step 6: Final answer
    x = 495,758.71

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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.