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Finding the Fourth Proportional to 918.87, 1,267.18 and 708.72

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Solution

The fourth proportional to 918.87, 1,267.18 and 708.72 is: 977.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.87 : 1,267.18 = 708.72 : x
  2. Step 2: Convert to fraction form
    918.87/1,267.18 = 708.72/x
  3. Step 3: Cross multiply
    918.87x = 1,267.18 × 708.72
  4. Step 4: Simplify right side
    918.87x = 898,069.29
  5. Step 5: Solve for x
    x = 898,069.29/918.87
  6. Step 6: Final answer
    x = 977.36

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1.5x scale

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.