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Finding the Fourth Proportional to 21,417.60, 32,164.80 and 15,580.80

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Solution

The fourth proportional to 21,417.60, 32,164.80 and 15,580.80 is: 23,399.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,417.60 : 32,164.80 = 15,580.80 : x
  2. Step 2: Convert to fraction form
    21,417.60/32,164.80 = 15,580.80/x
  3. Step 3: Cross multiply
    21,417.60x = 32,164.80 × 15,580.80
  4. Step 4: Simplify right side
    21,417.60x = 501,153,315.84
  5. Step 5: Solve for x
    x = 501,153,315.84/21,417.60
  6. Step 6: Final answer
    x = 23,399.14

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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.