Home / 21,000.53-31,500.79-12,689.93

Finding the Fourth Proportional to 21,000.53, 31,500.79 and 12,689.93

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Solution

The fourth proportional to 21,000.53, 31,500.79 and 12,689.93 is: 19,034.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,000.53 : 31,500.79 = 12,689.93 : x
  2. Step 2: Convert to fraction form
    21,000.53/31,500.79 = 12,689.93/x
  3. Step 3: Cross multiply
    21,000.53x = 31,500.79 × 12,689.93
  4. Step 4: Simplify right side
    21,000.53x = 399,742,630.82
  5. Step 5: Solve for x
    x = 399,742,630.82/21,000.53
  6. Step 6: Final answer
    x = 19,034.89

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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.