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Finding the Fourth Proportional to 1,386.60, 2,080.10 and 508.98

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Solution

The fourth proportional to 1,386.60, 2,080.10 and 508.98 is: 763.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.60 : 2,080.10 = 508.98 : x
  2. Step 2: Convert to fraction form
    1,386.60/2,080.10 = 508.98/x
  3. Step 3: Cross multiply
    1,386.60x = 2,080.10 × 508.98
  4. Step 4: Simplify right side
    1,386.60x = 1,058,729.30
  5. Step 5: Solve for x
    x = 1,058,729.30/1,386.60
  6. Step 6: Final answer
    x = 763.54

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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.