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Finding the Fourth Proportional to 1,386.50, 2,078.52 and 508.40

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Solution

The fourth proportional to 1,386.50, 2,078.52 and 508.40 is: 762.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.50 : 2,078.52 = 508.40 : x
  2. Step 2: Convert to fraction form
    1,386.50/2,078.52 = 508.40/x
  3. Step 3: Cross multiply
    1,386.50x = 2,078.52 × 508.40
  4. Step 4: Simplify right side
    1,386.50x = 1,056,724.48
  5. Step 5: Solve for x
    x = 1,056,724.48/1,386.50
  6. Step 6: Final answer
    x = 762.15

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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.