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Finding the Fourth Proportional to 15,279.80, 21,090.54 and 9,902.06

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Solution

The fourth proportional to 15,279.80, 21,090.54 and 9,902.06 is: 13,667.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,279.80 : 21,090.54 = 9,902.06 : x
  2. Step 2: Convert to fraction form
    15,279.80/21,090.54 = 9,902.06/x
  3. Step 3: Cross multiply
    15,279.80x = 21,090.54 × 9,902.06
  4. Step 4: Simplify right side
    15,279.80x = 208,839,792.51
  5. Step 5: Solve for x
    x = 208,839,792.51/15,279.80
  6. Step 6: Final answer
    x = 13,667.70

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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.