Home / 28,683.10-42,939.60-21,320.20

Finding the Fourth Proportional to 28,683.10, 42,939.60 and 21,320.20

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Solution

The fourth proportional to 28,683.10, 42,939.60 and 21,320.20 is: 31,917.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,683.10 : 42,939.60 = 21,320.20 : x
  2. Step 2: Convert to fraction form
    28,683.10/42,939.60 = 21,320.20/x
  3. Step 3: Cross multiply
    28,683.10x = 42,939.60 × 21,320.20
  4. Step 4: Simplify right side
    28,683.10x = 915,480,859.92
  5. Step 5: Solve for x
    x = 915,480,859.92/28,683.10
  6. Step 6: Final answer
    x = 31,917.08

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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.