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Finding the Fourth Proportional to 1,170.79, 1,756.15 and 477.28

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Solution

The fourth proportional to 1,170.79, 1,756.15 and 477.28 is: 715.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,170.79 : 1,756.15 = 477.28 : x
  2. Step 2: Convert to fraction form
    1,170.79/1,756.15 = 477.28/x
  3. Step 3: Cross multiply
    1,170.79x = 1,756.15 × 477.28
  4. Step 4: Simplify right side
    1,170.79x = 838,166.40
  5. Step 5: Solve for x
    x = 838,166.40/1,170.79
  6. Step 6: Final answer
    x = 715.90

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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.