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Finding the Fourth Proportional to 21,207.60, 29,731.60 and 21,207.60

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Solution

The fourth proportional to 21,207.60, 29,731.60 and 21,207.60 is: 29,731.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,207.60 : 29,731.60 = 21,207.60 : x
  2. Step 2: Convert to fraction form
    21,207.60/29,731.60 = 21,207.60/x
  3. Step 3: Cross multiply
    21,207.60x = 29,731.60 × 21,207.60
  4. Step 4: Simplify right side
    21,207.60x = 630,535,880.16
  5. Step 5: Solve for x
    x = 630,535,880.16/21,207.60
  6. Step 6: Final answer
    x = 29,731.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.