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Finding the Fourth Proportional to 12,386.90, 18,580.35 and 3,152.90

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Solution

The fourth proportional to 12,386.90, 18,580.35 and 3,152.90 is: 4,729.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,386.90 : 18,580.35 = 3,152.90 : x
  2. Step 2: Convert to fraction form
    12,386.90/18,580.35 = 3,152.90/x
  3. Step 3: Cross multiply
    12,386.90x = 18,580.35 × 3,152.90
  4. Step 4: Simplify right side
    12,386.90x = 58,581,985.52
  5. Step 5: Solve for x
    x = 58,581,985.52/12,386.90
  6. Step 6: Final answer
    x = 4,729.35

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1.5x scale

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.