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Finding the Fourth Proportional to 645,886.71, 891,311.85 and 359,404.29

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Solution

The fourth proportional to 645,886.71, 891,311.85 and 359,404.29 is: 495,971.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,886.71 : 891,311.85 = 359,404.29 : x
  2. Step 2: Convert to fraction form
    645,886.71/891,311.85 = 359,404.29/x
  3. Step 3: Cross multiply
    645,886.71x = 891,311.85 × 359,404.29
  4. Step 4: Simplify right side
    645,886.71x = 320,341,302,617.84
  5. Step 5: Solve for x
    x = 320,341,302,617.84/645,886.71
  6. Step 6: Final answer
    x = 495,971.35

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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.