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Finding the Fourth Proportional to 28,607.40, 42,871.60 and 20,646.45

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Solution

The fourth proportional to 28,607.40, 42,871.60 and 20,646.45 is: 30,941.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,607.40 : 42,871.60 = 20,646.45 : x
  2. Step 2: Convert to fraction form
    28,607.40/42,871.60 = 20,646.45/x
  3. Step 3: Cross multiply
    28,607.40x = 42,871.60 × 20,646.45
  4. Step 4: Simplify right side
    28,607.40x = 885,146,345.82
  5. Step 5: Solve for x
    x = 885,146,345.82/28,607.40
  6. Step 6: Final answer
    x = 30,941.17

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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.