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Finding the Fourth Proportional to 1,386.04, 2,077.62 and 655

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Solution

The fourth proportional to 1,386.04, 2,077.62 and 655 is: 981.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.04 : 2,077.62 = 655 : x
  2. Step 2: Convert to fraction form
    1,386.04/2,077.62 = 655/x
  3. Step 3: Cross multiply
    1,386.04x = 2,077.62 × 655
  4. Step 4: Simplify right side
    1,386.04x = 1,360,841.10
  5. Step 5: Solve for x
    x = 1,360,841.10/1,386.04
  6. Step 6: Final answer
    x = 981.82

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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.