Home / 28,670.10-42,920.10-21,307.20

Finding the Fourth Proportional to 28,670.10, 42,920.10 and 21,307.20

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Solution

The fourth proportional to 28,670.10, 42,920.10 and 21,307.20 is: 31,897.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,670.10 : 42,920.10 = 21,307.20 : x
  2. Step 2: Convert to fraction form
    28,670.10/42,920.10 = 21,307.20/x
  3. Step 3: Cross multiply
    28,670.10x = 42,920.10 × 21,307.20
  4. Step 4: Simplify right side
    28,670.10x = 914,507,154.72
  5. Step 5: Solve for x
    x = 914,507,154.72/28,670.10
  6. Step 6: Final answer
    x = 31,897.59

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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.