Home / 7,315.20-10,121.22-6,386.40

Finding the Fourth Proportional to 7,315.20, 10,121.22 and 6,386.40

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Solution

The fourth proportional to 7,315.20, 10,121.22 and 6,386.40 is: 8,836.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,315.20 : 10,121.22 = 6,386.40 : x
  2. Step 2: Convert to fraction form
    7,315.20/10,121.22 = 6,386.40/x
  3. Step 3: Cross multiply
    7,315.20x = 10,121.22 × 6,386.40
  4. Step 4: Simplify right side
    7,315.20x = 64,638,159.41
  5. Step 5: Solve for x
    x = 64,638,159.41/7,315.20
  6. Step 6: Final answer
    x = 8,836.14

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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.