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Finding the Fourth Proportional to 15,356.61, 21,184.35 and 8,979.03

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Solution

The fourth proportional to 15,356.61, 21,184.35 and 8,979.03 is: 12,386.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,356.61 : 21,184.35 = 8,979.03 : x
  2. Step 2: Convert to fraction form
    15,356.61/21,184.35 = 8,979.03/x
  3. Step 3: Cross multiply
    15,356.61x = 21,184.35 × 8,979.03
  4. Step 4: Simplify right side
    15,356.61x = 190,214,914.18
  5. Step 5: Solve for x
    x = 190,214,914.18/15,356.61
  6. Step 6: Final answer
    x = 12,386.52

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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.