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Finding the Fourth Proportional to 390,279.15, 585,473.40 and 165,637.80

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Solution

The fourth proportional to 390,279.15, 585,473.40 and 165,637.80 is: 248,479.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,279.15 : 585,473.40 = 165,637.80 : x
  2. Step 2: Convert to fraction form
    390,279.15/585,473.40 = 165,637.80/x
  3. Step 3: Cross multiply
    390,279.15x = 585,473.40 × 165,637.80
  4. Step 4: Simplify right side
    390,279.15x = 96,976,525,934.52
  5. Step 5: Solve for x
    x = 96,976,525,934.52/390,279.15
  6. Step 6: Final answer
    x = 248,479.90

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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.