Home / 15,315.89-21,070.31-14,659.79

Finding the Fourth Proportional to 15,315.89, 21,070.31 and 14,659.79

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Solution

The fourth proportional to 15,315.89, 21,070.31 and 14,659.79 is: 20,167.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,315.89 : 21,070.31 = 14,659.79 : x
  2. Step 2: Convert to fraction form
    15,315.89/21,070.31 = 14,659.79/x
  3. Step 3: Cross multiply
    15,315.89x = 21,070.31 × 14,659.79
  4. Step 4: Simplify right side
    15,315.89x = 308,886,319.83
  5. Step 5: Solve for x
    x = 308,886,319.83/15,315.89
  6. Step 6: Final answer
    x = 20,167.70

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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.