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Finding the Fourth Proportional to 390,641.94, 585,920.54 and 124,381.52

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Solution

The fourth proportional to 390,641.94, 585,920.54 and 124,381.52 is: 186,558.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,641.94 : 585,920.54 = 124,381.52 : x
  2. Step 2: Convert to fraction form
    390,641.94/585,920.54 = 124,381.52/x
  3. Step 3: Cross multiply
    390,641.94x = 585,920.54 × 124,381.52
  4. Step 4: Simplify right side
    390,641.94x = 72,877,689,539.13
  5. Step 5: Solve for x
    x = 72,877,689,539.13/390,641.94
  6. Step 6: Final answer
    x = 186,558.79

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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.