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Finding the Fourth Proportional to 1,387.48, 2,080.85 and 554.51

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Solution

The fourth proportional to 1,387.48, 2,080.85 and 554.51 is: 831.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.48 : 2,080.85 = 554.51 : x
  2. Step 2: Convert to fraction form
    1,387.48/2,080.85 = 554.51/x
  3. Step 3: Cross multiply
    1,387.48x = 2,080.85 × 554.51
  4. Step 4: Simplify right side
    1,387.48x = 1,153,852.13
  5. Step 5: Solve for x
    x = 1,153,852.13/1,387.48
  6. Step 6: Final answer
    x = 831.62

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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.