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Finding the Fourth Proportional to 390,612.65, 539,060.77 and 229,466.28

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Solution

The fourth proportional to 390,612.65, 539,060.77 and 229,466.28 is: 316,672.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,612.65 : 539,060.77 = 229,466.28 : x
  2. Step 2: Convert to fraction form
    390,612.65/539,060.77 = 229,466.28/x
  3. Step 3: Cross multiply
    390,612.65x = 539,060.77 × 229,466.28
  4. Step 4: Simplify right side
    390,612.65x = 123,696,271,894.15
  5. Step 5: Solve for x
    x = 123,696,271,894.15/390,612.65
  6. Step 6: Final answer
    x = 316,672.47

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.