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Finding the Fourth Proportional to 458,686.20, 688,029.30 and 423,256.80

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Solution

The fourth proportional to 458,686.20, 688,029.30 and 423,256.80 is: 634,885.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    458,686.20 : 688,029.30 = 423,256.80 : x
  2. Step 2: Convert to fraction form
    458,686.20/688,029.30 = 423,256.80/x
  3. Step 3: Cross multiply
    458,686.20x = 688,029.30 × 423,256.80
  4. Step 4: Simplify right side
    458,686.20x = 291,213,079,824.24
  5. Step 5: Solve for x
    x = 291,213,079,824.24/458,686.20
  6. Step 6: Final answer
    x = 634,885.20

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Similar ratio
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1.5x scale

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.