Home / 28,487.61-39,312.54-15,740.78

Finding the Fourth Proportional to 28,487.61, 39,312.54 and 15,740.78

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Solution

The fourth proportional to 28,487.61, 39,312.54 and 15,740.78 is: 21,722.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,487.61 : 39,312.54 = 15,740.78 : x
  2. Step 2: Convert to fraction form
    28,487.61/39,312.54 = 15,740.78/x
  3. Step 3: Cross multiply
    28,487.61x = 39,312.54 × 15,740.78
  4. Step 4: Simplify right side
    28,487.61x = 618,809,846.82
  5. Step 5: Solve for x
    x = 618,809,846.82/28,487.61
  6. Step 6: Final answer
    x = 21,722.07

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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.