Home / 15,321.78-21,152.12-10,312.34

Finding the Fourth Proportional to 15,321.78, 21,152.12 and 10,312.34

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Solution

The fourth proportional to 15,321.78, 21,152.12 and 10,312.34 is: 14,236.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,321.78 : 21,152.12 = 10,312.34 : x
  2. Step 2: Convert to fraction form
    15,321.78/21,152.12 = 10,312.34/x
  3. Step 3: Cross multiply
    15,321.78x = 21,152.12 × 10,312.34
  4. Step 4: Simplify right side
    15,321.78x = 218,127,853.16
  5. Step 5: Solve for x
    x = 218,127,853.16/15,321.78
  6. Step 6: Final answer
    x = 14,236.46

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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.