Home / 15,315.15-21,136.86-9,345.55

Finding the Fourth Proportional to 15,315.15, 21,136.86 and 9,345.55

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Solution

The fourth proportional to 15,315.15, 21,136.86 and 9,345.55 is: 12,898.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,315.15 : 21,136.86 = 9,345.55 : x
  2. Step 2: Convert to fraction form
    15,315.15/21,136.86 = 9,345.55/x
  3. Step 3: Cross multiply
    15,315.15x = 21,136.86 × 9,345.55
  4. Step 4: Simplify right side
    15,315.15x = 197,535,581.97
  5. Step 5: Solve for x
    x = 197,535,581.97/15,315.15
  6. Step 6: Final answer
    x = 12,898.05

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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.