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Finding the Fourth Proportional to 390,646.52, 585,986.80 and 191,134.88

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Solution

The fourth proportional to 390,646.52, 585,986.80 and 191,134.88 is: 286,710.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,646.52 : 585,986.80 = 191,134.88 : x
  2. Step 2: Convert to fraction form
    390,646.52/585,986.80 = 191,134.88/x
  3. Step 3: Cross multiply
    390,646.52x = 585,986.80 × 191,134.88
  4. Step 4: Simplify right side
    390,646.52x = 112,002,516,699.58
  5. Step 5: Solve for x
    x = 112,002,516,699.58/390,646.52
  6. Step 6: Final answer
    x = 286,710.65

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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.