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Finding the Fourth Proportional to 13,387.86, 18,477.53 and 7,721.59

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Solution

The fourth proportional to 13,387.86, 18,477.53 and 7,721.59 is: 10,657.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,387.86 : 18,477.53 = 7,721.59 : x
  2. Step 2: Convert to fraction form
    13,387.86/18,477.53 = 7,721.59/x
  3. Step 3: Cross multiply
    13,387.86x = 18,477.53 × 7,721.59
  4. Step 4: Simplify right side
    13,387.86x = 142,675,926.51
  5. Step 5: Solve for x
    x = 142,675,926.51/13,387.86
  6. Step 6: Final answer
    x = 10,657.11

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.