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Finding the Fourth Proportional to 875.26, 1,312.90 and 413.40

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Solution

The fourth proportional to 875.26, 1,312.90 and 413.40 is: 620.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.26 : 1,312.90 = 413.40 : x
  2. Step 2: Convert to fraction form
    875.26/1,312.90 = 413.40/x
  3. Step 3: Cross multiply
    875.26x = 1,312.90 × 413.40
  4. Step 4: Simplify right side
    875.26x = 542,752.86
  5. Step 5: Solve for x
    x = 542,752.86/875.26
  6. Step 6: Final answer
    x = 620.10

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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.