Home / 1,587.48-2,189.51-1,390.65

Finding the Fourth Proportional to 1,587.48, 2,189.51 and 1,390.65

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Solution

The fourth proportional to 1,587.48, 2,189.51 and 1,390.65 is: 1,918.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,587.48 : 2,189.51 = 1,390.65 : x
  2. Step 2: Convert to fraction form
    1,587.48/2,189.51 = 1,390.65/x
  3. Step 3: Cross multiply
    1,587.48x = 2,189.51 × 1,390.65
  4. Step 4: Simplify right side
    1,587.48x = 3,044,839.95
  5. Step 5: Solve for x
    x = 3,044,839.95/1,587.48
  6. Step 6: Final answer
    x = 1,918.04

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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.