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Finding the Fourth Proportional to 1,061.70, 1,465.64 and 708.21

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Solution

The fourth proportional to 1,061.70, 1,465.64 and 708.21 is: 977.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,061.70 : 1,465.64 = 708.21 : x
  2. Step 2: Convert to fraction form
    1,061.70/1,465.64 = 708.21/x
  3. Step 3: Cross multiply
    1,061.70x = 1,465.64 × 708.21
  4. Step 4: Simplify right side
    1,061.70x = 1,037,980.90
  5. Step 5: Solve for x
    x = 1,037,980.90/1,061.70
  6. Step 6: Final answer
    x = 977.66

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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.