Home / 390,923.16-539,001.18-330,387

Finding the Fourth Proportional to 390,923.16, 539,001.18 and 330,387

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Solution

The fourth proportional to 390,923.16, 539,001.18 and 330,387 is: 455,534.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,923.16 : 539,001.18 = 330,387 : x
  2. Step 2: Convert to fraction form
    390,923.16/539,001.18 = 330,387/x
  3. Step 3: Cross multiply
    390,923.16x = 539,001.18 × 330,387
  4. Step 4: Simplify right side
    390,923.16x = 178,078,982,856.66
  5. Step 5: Solve for x
    x = 178,078,982,856.66/390,923.16
  6. Step 6: Final answer
    x = 455,534.49

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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.