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Finding the Fourth Proportional to 870.84, 1,200.90 and 575.76

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Solution

The fourth proportional to 870.84, 1,200.90 and 575.76 is: 793.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.84 : 1,200.90 = 575.76 : x
  2. Step 2: Convert to fraction form
    870.84/1,200.90 = 575.76/x
  3. Step 3: Cross multiply
    870.84x = 1,200.90 × 575.76
  4. Step 4: Simplify right side
    870.84x = 691,430.18
  5. Step 5: Solve for x
    x = 691,430.18/870.84
  6. Step 6: Final answer
    x = 793.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.