Home / 28,981.86-39,990.15-18,368.70

Finding the Fourth Proportional to 28,981.86, 39,990.15 and 18,368.70

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Solution

The fourth proportional to 28,981.86, 39,990.15 and 18,368.70 is: 25,345.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,981.86 : 39,990.15 = 18,368.70 : x
  2. Step 2: Convert to fraction form
    28,981.86/39,990.15 = 18,368.70/x
  3. Step 3: Cross multiply
    28,981.86x = 39,990.15 × 18,368.70
  4. Step 4: Simplify right side
    28,981.86x = 734,567,068.31
  5. Step 5: Solve for x
    x = 734,567,068.31/28,981.86
  6. Step 6: Final answer
    x = 25,345.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.