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Finding the Fourth Proportional to 28,663.76, 42,987.96 and 7,888.40

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Solution

The fourth proportional to 28,663.76, 42,987.96 and 7,888.40 is: 11,830.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,663.76 : 42,987.96 = 7,888.40 : x
  2. Step 2: Convert to fraction form
    28,663.76/42,987.96 = 7,888.40/x
  3. Step 3: Cross multiply
    28,663.76x = 42,987.96 × 7,888.40
  4. Step 4: Simplify right side
    28,663.76x = 339,106,223.66
  5. Step 5: Solve for x
    x = 339,106,223.66/28,663.76
  6. Step 6: Final answer
    x = 11,830.49

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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.