Home / 42,390.40-63,585.60-12,812.80

Finding the Fourth Proportional to 42,390.40, 63,585.60 and 12,812.80

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Solution

The fourth proportional to 42,390.40, 63,585.60 and 12,812.80 is: 19,219.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,390.40 : 63,585.60 = 12,812.80 : x
  2. Step 2: Convert to fraction form
    42,390.40/63,585.60 = 12,812.80/x
  3. Step 3: Cross multiply
    42,390.40x = 63,585.60 × 12,812.80
  4. Step 4: Simplify right side
    42,390.40x = 814,709,575.68
  5. Step 5: Solve for x
    x = 814,709,575.68/42,390.40
  6. Step 6: Final answer
    x = 19,219.20

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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.