Home / 9,315.36-12,855.28-5,123.68

Finding the Fourth Proportional to 9,315.36, 12,855.28 and 5,123.68

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Solution

The fourth proportional to 9,315.36, 12,855.28 and 5,123.68 is: 7,070.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,315.36 : 12,855.28 = 5,123.68 : x
  2. Step 2: Convert to fraction form
    9,315.36/12,855.28 = 5,123.68/x
  3. Step 3: Cross multiply
    9,315.36x = 12,855.28 × 5,123.68
  4. Step 4: Simplify right side
    9,315.36x = 65,866,341.03
  5. Step 5: Solve for x
    x = 65,866,341.03/9,315.36
  6. Step 6: Final answer
    x = 7,070.72

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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.