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Finding the Fourth Proportional to 1,150.40, 1,587.60 and 708.20

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Solution

The fourth proportional to 1,150.40, 1,587.60 and 708.20 is: 977.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,150.40 : 1,587.60 = 708.20 : x
  2. Step 2: Convert to fraction form
    1,150.40/1,587.60 = 708.20/x
  3. Step 3: Cross multiply
    1,150.40x = 1,587.60 × 708.20
  4. Step 4: Simplify right side
    1,150.40x = 1,124,338.32
  5. Step 5: Solve for x
    x = 1,124,338.32/1,150.40
  6. Step 6: Final answer
    x = 977.35

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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.