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Finding the Fourth Proportional to 499,666.26, 689,345.76 and 318,345.72

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Solution

The fourth proportional to 499,666.26, 689,345.76 and 318,345.72 is: 439,193.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    499,666.26 : 689,345.76 = 318,345.72 : x
  2. Step 2: Convert to fraction form
    499,666.26/689,345.76 = 318,345.72/x
  3. Step 3: Cross multiply
    499,666.26x = 689,345.76 × 318,345.72
  4. Step 4: Simplify right side
    499,666.26x = 219,450,272,296.15
  5. Step 5: Solve for x
    x = 219,450,272,296.15/499,666.26
  6. Step 6: Final answer
    x = 439,193.70

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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.