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Finding the Fourth Proportional to 875.40, 1,313.38 and 413.16

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Solution

The fourth proportional to 875.40, 1,313.38 and 413.16 is: 619.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.40 : 1,313.38 = 413.16 : x
  2. Step 2: Convert to fraction form
    875.40/1,313.38 = 413.16/x
  3. Step 3: Cross multiply
    875.40x = 1,313.38 × 413.16
  4. Step 4: Simplify right side
    875.40x = 542,636.08
  5. Step 5: Solve for x
    x = 542,636.08/875.40
  6. Step 6: Final answer
    x = 619.87

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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.