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Finding the Fourth Proportional to 875.79, 1,313.58 and 413.48

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Solution

The fourth proportional to 875.79, 1,313.58 and 413.48 is: 620.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.79 : 1,313.58 = 413.48 : x
  2. Step 2: Convert to fraction form
    875.79/1,313.58 = 413.48/x
  3. Step 3: Cross multiply
    875.79x = 1,313.58 × 413.48
  4. Step 4: Simplify right side
    875.79x = 543,139.06
  5. Step 5: Solve for x
    x = 543,139.06/875.79
  6. Step 6: Final answer
    x = 620.17

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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.