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Finding the Fourth Proportional to 714,987.51, 986,690.88 and 392,705.12

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Solution

The fourth proportional to 714,987.51, 986,690.88 and 392,705.12 is: 541,937.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    714,987.51 : 986,690.88 = 392,705.12 : x
  2. Step 2: Convert to fraction form
    714,987.51/986,690.88 = 392,705.12/x
  3. Step 3: Cross multiply
    714,987.51x = 986,690.88 × 392,705.12
  4. Step 4: Simplify right side
    714,987.51x = 387,478,555,499.85
  5. Step 5: Solve for x
    x = 387,478,555,499.85/714,987.51
  6. Step 6: Final answer
    x = 541,937.52

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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.