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Finding the Fourth Proportional to 390,612.54, 585,918.81 and 124,454.64

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Solution

The fourth proportional to 390,612.54, 585,918.81 and 124,454.64 is: 186,681.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,612.54 : 585,918.81 = 124,454.64 : x
  2. Step 2: Convert to fraction form
    390,612.54/585,918.81 = 124,454.64/x
  3. Step 3: Cross multiply
    390,612.54x = 585,918.81 × 124,454.64
  4. Step 4: Simplify right side
    390,612.54x = 72,920,314,567.78
  5. Step 5: Solve for x
    x = 72,920,314,567.78/390,612.54
  6. Step 6: Final answer
    x = 186,681.96

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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.