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Finding the Fourth Proportional to 21,035.31, 31,548.51 and 7,888.65

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Solution

The fourth proportional to 21,035.31, 31,548.51 and 7,888.65 is: 11,831.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,035.31 : 31,548.51 = 7,888.65 : x
  2. Step 2: Convert to fraction form
    21,035.31/31,548.51 = 7,888.65/x
  3. Step 3: Cross multiply
    21,035.31x = 31,548.51 × 7,888.65
  4. Step 4: Simplify right side
    21,035.31x = 248,875,153.41
  5. Step 5: Solve for x
    x = 248,875,153.41/21,035.31
  6. Step 6: Final answer
    x = 11,831.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.