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Finding the Fourth Proportional to 518,128.52, 714,988.83 and 285,509.65

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Solution

The fourth proportional to 518,128.52, 714,988.83 and 285,509.65 is: 393,987.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,128.52 : 714,988.83 = 285,509.65 : x
  2. Step 2: Convert to fraction form
    518,128.52/714,988.83 = 285,509.65/x
  3. Step 3: Cross multiply
    518,128.52x = 714,988.83 × 285,509.65
  4. Step 4: Simplify right side
    518,128.52x = 204,136,209,890.40
  5. Step 5: Solve for x
    x = 204,136,209,890.40/518,128.52
  6. Step 6: Final answer
    x = 393,987.60

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1.5x scale

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.