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Finding the Fourth Proportional to 28,642.79, 42,980.99 and 12,001.56

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Solution

The fourth proportional to 28,642.79, 42,980.99 and 12,001.56 is: 18,009.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,642.79 : 42,980.99 = 12,001.56 : x
  2. Step 2: Convert to fraction form
    28,642.79/42,980.99 = 12,001.56/x
  3. Step 3: Cross multiply
    28,642.79x = 42,980.99 × 12,001.56
  4. Step 4: Simplify right side
    28,642.79x = 515,838,870.34
  5. Step 5: Solve for x
    x = 515,838,870.34/28,642.79
  6. Step 6: Final answer
    x = 18,009.38

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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.