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Finding the Fourth Proportional to 390,642.21, 586,006.25 and 124,340.36

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Solution

The fourth proportional to 390,642.21, 586,006.25 and 124,340.36 is: 186,524.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,642.21 : 586,006.25 = 124,340.36 : x
  2. Step 2: Convert to fraction form
    390,642.21/586,006.25 = 124,340.36/x
  3. Step 3: Cross multiply
    390,642.21x = 586,006.25 × 124,340.36
  4. Step 4: Simplify right side
    390,642.21x = 72,864,224,535.52
  5. Step 5: Solve for x
    x = 72,864,224,535.52/390,642.21
  6. Step 6: Final answer
    x = 186,524.20

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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.