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Finding the Fourth Proportional to 499,642.61, 689,313.17 and 318,322.08

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Solution

The fourth proportional to 499,642.61, 689,313.17 and 318,322.08 is: 439,161.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    499,642.61 : 689,313.17 = 318,322.08 : x
  2. Step 2: Convert to fraction form
    499,642.61/689,313.17 = 318,322.08/x
  3. Step 3: Cross multiply
    499,642.61x = 689,313.17 × 318,322.08
  4. Step 4: Simplify right side
    499,642.61x = 219,423,602,841.60
  5. Step 5: Solve for x
    x = 219,423,602,841.60/499,642.61
  6. Step 6: Final answer
    x = 439,161.11

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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.