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Finding the Fourth Proportional to 21,758.40, 32,639.76 and 7,904.16

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Solution

The fourth proportional to 21,758.40, 32,639.76 and 7,904.16 is: 11,857.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,758.40 : 32,639.76 = 7,904.16 : x
  2. Step 2: Convert to fraction form
    21,758.40/32,639.76 = 7,904.16/x
  3. Step 3: Cross multiply
    21,758.40x = 32,639.76 × 7,904.16
  4. Step 4: Simplify right side
    21,758.40x = 257,989,885.40
  5. Step 5: Solve for x
    x = 257,989,885.40/21,758.40
  6. Step 6: Final answer
    x = 11,857.02

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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.