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Finding the Fourth Proportional to 518,129.40, 714,990.04 and 285,510.53

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Solution

The fourth proportional to 518,129.40, 714,990.04 and 285,510.53 is: 393,988.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,129.40 : 714,990.04 = 285,510.53 : x
  2. Step 2: Convert to fraction form
    518,129.40/714,990.04 = 285,510.53/x
  3. Step 3: Cross multiply
    518,129.40x = 714,990.04 × 285,510.53
  4. Step 4: Simplify right side
    518,129.40x = 204,137,180,262.62
  5. Step 5: Solve for x
    x = 204,137,180,262.62/518,129.40
  6. Step 6: Final answer
    x = 393,988.80

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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.