Home / 28,280.20-42,420.30-19,985.80

Finding the Fourth Proportional to 28,280.20, 42,420.30 and 19,985.80

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Solution

The fourth proportional to 28,280.20, 42,420.30 and 19,985.80 is: 29,978.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,280.20 : 42,420.30 = 19,985.80 : x
  2. Step 2: Convert to fraction form
    28,280.20/42,420.30 = 19,985.80/x
  3. Step 3: Cross multiply
    28,280.20x = 42,420.30 × 19,985.80
  4. Step 4: Simplify right side
    28,280.20x = 847,803,631.74
  5. Step 5: Solve for x
    x = 847,803,631.74/28,280.20
  6. Step 6: Final answer
    x = 29,978.70

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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.