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Finding the Fourth Proportional to 390,862.34, 586,287.35 and 124,621.06

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Solution

The fourth proportional to 390,862.34, 586,287.35 and 124,621.06 is: 186,929.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,862.34 : 586,287.35 = 124,621.06 : x
  2. Step 2: Convert to fraction form
    390,862.34/586,287.35 = 124,621.06/x
  3. Step 3: Cross multiply
    390,862.34x = 586,287.35 × 124,621.06
  4. Step 4: Simplify right side
    390,862.34x = 73,063,751,021.59
  5. Step 5: Solve for x
    x = 73,063,751,021.59/390,862.34
  6. Step 6: Final answer
    x = 186,929.63

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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.