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Finding the Fourth Proportional to 431,312.40, 646,482.60 and 206,780.40

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Solution

The fourth proportional to 431,312.40, 646,482.60 and 206,780.40 is: 309,937.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,312.40 : 646,482.60 = 206,780.40 : x
  2. Step 2: Convert to fraction form
    431,312.40/646,482.60 = 206,780.40/x
  3. Step 3: Cross multiply
    431,312.40x = 646,482.60 × 206,780.40
  4. Step 4: Simplify right side
    431,312.40x = 133,679,930,621.04
  5. Step 5: Solve for x
    x = 133,679,930,621.04/431,312.40
  6. Step 6: Final answer
    x = 309,937.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.