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Finding the Fourth Proportional to 645,967.54, 891,428.70 and 359,482.78

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Solution

The fourth proportional to 645,967.54, 891,428.70 and 359,482.78 is: 496,082.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,967.54 : 891,428.70 = 359,482.78 : x
  2. Step 2: Convert to fraction form
    645,967.54/891,428.70 = 359,482.78/x
  3. Step 3: Cross multiply
    645,967.54x = 891,428.70 × 359,482.78
  4. Step 4: Simplify right side
    645,967.54x = 320,453,267,247.79
  5. Step 5: Solve for x
    x = 320,453,267,247.79/645,967.54
  6. Step 6: Final answer
    x = 496,082.62

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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.