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Finding the Fourth Proportional to 6,290.40, 9,386.40 and 6,247.20

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Solution

The fourth proportional to 6,290.40, 9,386.40 and 6,247.20 is: 9,321.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,290.40 : 9,386.40 = 6,247.20 : x
  2. Step 2: Convert to fraction form
    6,290.40/9,386.40 = 6,247.20/x
  3. Step 3: Cross multiply
    6,290.40x = 9,386.40 × 6,247.20
  4. Step 4: Simplify right side
    6,290.40x = 58,638,718.08
  5. Step 5: Solve for x
    x = 58,638,718.08/6,290.40
  6. Step 6: Final answer
    x = 9,321.94

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.