Home / 1,587.12-2,380.70-561.12

Finding the Fourth Proportional to 1,587.12, 2,380.70 and 561.12

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Solution

The fourth proportional to 1,587.12, 2,380.70 and 561.12 is: 841.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,587.12 : 2,380.70 = 561.12 : x
  2. Step 2: Convert to fraction form
    1,587.12/2,380.70 = 561.12/x
  3. Step 3: Cross multiply
    1,587.12x = 2,380.70 × 561.12
  4. Step 4: Simplify right side
    1,587.12x = 1,335,858.38
  5. Step 5: Solve for x
    x = 1,335,858.38/1,587.12
  6. Step 6: Final answer
    x = 841.69

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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.