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Finding the Fourth Proportional to 458,730.40, 688,095.60 and 388,919.20

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Solution

The fourth proportional to 458,730.40, 688,095.60 and 388,919.20 is: 583,378.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    458,730.40 : 688,095.60 = 388,919.20 : x
  2. Step 2: Convert to fraction form
    458,730.40/688,095.60 = 388,919.20/x
  3. Step 3: Cross multiply
    458,730.40x = 688,095.60 × 388,919.20
  4. Step 4: Simplify right side
    458,730.40x = 267,613,590,275.52
  5. Step 5: Solve for x
    x = 267,613,590,275.52/458,730.40
  6. Step 6: Final answer
    x = 583,378.80

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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.