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Finding the Fourth Proportional to 15,871.51, 21,898.35 and 9,904.14

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Solution

The fourth proportional to 15,871.51, 21,898.35 and 9,904.14 is: 13,665.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,871.51 : 21,898.35 = 9,904.14 : x
  2. Step 2: Convert to fraction form
    15,871.51/21,898.35 = 9,904.14/x
  3. Step 3: Cross multiply
    15,871.51x = 21,898.35 × 9,904.14
  4. Step 4: Simplify right side
    15,871.51x = 216,884,324.17
  5. Step 5: Solve for x
    x = 216,884,324.17/15,871.51
  6. Step 6: Final answer
    x = 13,665.01

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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.