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Finding the Fourth Proportional to 28,643.52, 42,926.40 and 21,275.76

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Solution

The fourth proportional to 28,643.52, 42,926.40 and 21,275.76 is: 31,884.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,643.52 : 42,926.40 = 21,275.76 : x
  2. Step 2: Convert to fraction form
    28,643.52/42,926.40 = 21,275.76/x
  3. Step 3: Cross multiply
    28,643.52x = 42,926.40 × 21,275.76
  4. Step 4: Simplify right side
    28,643.52x = 913,291,784.06
  5. Step 5: Solve for x
    x = 913,291,784.06/28,643.52
  6. Step 6: Final answer
    x = 31,884.76

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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.