Home / 9,315.40-12,855.14-5,123.64

Finding the Fourth Proportional to 9,315.40, 12,855.14 and 5,123.64

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Solution

The fourth proportional to 9,315.40, 12,855.14 and 5,123.64 is: 7,070.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,315.40 : 12,855.14 = 5,123.64 : x
  2. Step 2: Convert to fraction form
    9,315.40/12,855.14 = 5,123.64/x
  3. Step 3: Cross multiply
    9,315.40x = 12,855.14 × 5,123.64
  4. Step 4: Simplify right side
    9,315.40x = 65,865,109.51
  5. Step 5: Solve for x
    x = 65,865,109.51/9,315.40
  6. Step 6: Final answer
    x = 7,070.56

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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.