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Finding the Fourth Proportional to 875.20, 1,312.20 and 413.20

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Solution

The fourth proportional to 875.20, 1,312.20 and 413.20 is: 619.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.20 : 1,312.20 = 413.20 : x
  2. Step 2: Convert to fraction form
    875.20/1,312.20 = 413.20/x
  3. Step 3: Cross multiply
    875.20x = 1,312.20 × 413.20
  4. Step 4: Simplify right side
    875.20x = 542,201.04
  5. Step 5: Solve for x
    x = 542,201.04/875.20
  6. Step 6: Final answer
    x = 619.52

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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.