Home / 1,587.02-2,380.32-721.13

Finding the Fourth Proportional to 1,587.02, 2,380.32 and 721.13

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Solution

The fourth proportional to 1,587.02, 2,380.32 and 721.13 is: 1,081.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,587.02 : 2,380.32 = 721.13 : x
  2. Step 2: Convert to fraction form
    1,587.02/2,380.32 = 721.13/x
  3. Step 3: Cross multiply
    1,587.02x = 2,380.32 × 721.13
  4. Step 4: Simplify right side
    1,587.02x = 1,716,508.26
  5. Step 5: Solve for x
    x = 1,716,508.26/1,587.02
  6. Step 6: Final answer
    x = 1,081.60

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1.5x scale

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.