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Finding the Fourth Proportional to 790.20, 1,186.20 and 424.80

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Solution

The fourth proportional to 790.20, 1,186.20 and 424.80 is: 637.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.20 : 1,186.20 = 424.80 : x
  2. Step 2: Convert to fraction form
    790.20/1,186.20 = 424.80/x
  3. Step 3: Cross multiply
    790.20x = 1,186.20 × 424.80
  4. Step 4: Simplify right side
    790.20x = 503,897.76
  5. Step 5: Solve for x
    x = 503,897.76/790.20
  6. Step 6: Final answer
    x = 637.68

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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.