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

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Solution

The fourth proportional to 21,000.53, 31,500.79 and 21,000.53 is: 31,500.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,000.53 : 31,500.79 = 21,000.53 : x
  2. Step 2: Convert to fraction form
    21,000.53/31,500.79 = 21,000.53/x
  3. Step 3: Cross multiply
    21,000.53x = 31,500.79 × 21,000.53
  4. Step 4: Simplify right side
    21,000.53x = 661,533,075.41
  5. Step 5: Solve for x
    x = 661,533,075.41/21,000.53
  6. Step 6: Final answer
    x = 31,500.79

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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.