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Finding the Fourth Proportional to 12,356.40, 18,532.80 and 3,590.40

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Solution

The fourth proportional to 12,356.40, 18,532.80 and 3,590.40 is: 5,385.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,356.40 : 18,532.80 = 3,590.40 : x
  2. Step 2: Convert to fraction form
    12,356.40/18,532.80 = 3,590.40/x
  3. Step 3: Cross multiply
    12,356.40x = 18,532.80 × 3,590.40
  4. Step 4: Simplify right side
    12,356.40x = 66,540,165.12
  5. Step 5: Solve for x
    x = 66,540,165.12/12,356.40
  6. Step 6: Final answer
    x = 5,385.08

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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.