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Finding the Fourth Proportional to 21,798.55, 30,081.09 and 12,368.89

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Solution

The fourth proportional to 21,798.55, 30,081.09 and 12,368.89 is: 17,068.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,798.55 : 30,081.09 = 12,368.89 : x
  2. Step 2: Convert to fraction form
    21,798.55/30,081.09 = 12,368.89/x
  3. Step 3: Cross multiply
    21,798.55x = 30,081.09 × 12,368.89
  4. Step 4: Simplify right side
    21,798.55x = 372,069,693.29
  5. Step 5: Solve for x
    x = 372,069,693.29/21,798.55
  6. Step 6: Final answer
    x = 17,068.55

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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.