Home / 21,235.74-31,818.72-12,918.16

Finding the Fourth Proportional to 21,235.74, 31,818.72 and 12,918.16

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Solution

The fourth proportional to 21,235.74, 31,818.72 and 12,918.16 is: 19,356.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,235.74 : 31,818.72 = 12,918.16 : x
  2. Step 2: Convert to fraction form
    21,235.74/31,818.72 = 12,918.16/x
  3. Step 3: Cross multiply
    21,235.74x = 31,818.72 × 12,918.16
  4. Step 4: Simplify right side
    21,235.74x = 411,039,315.96
  5. Step 5: Solve for x
    x = 411,039,315.96/21,235.74
  6. Step 6: Final answer
    x = 19,356.02

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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.