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Finding the Fourth Proportional to 6,894.79, 9,515.80 and 3,870.23

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Solution

The fourth proportional to 6,894.79, 9,515.80 and 3,870.23 is: 5,341.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,894.79 : 9,515.80 = 3,870.23 : x
  2. Step 2: Convert to fraction form
    6,894.79/9,515.80 = 3,870.23/x
  3. Step 3: Cross multiply
    6,894.79x = 9,515.80 × 3,870.23
  4. Step 4: Simplify right side
    6,894.79x = 36,828,315.28
  5. Step 5: Solve for x
    x = 36,828,315.28/6,894.79
  6. Step 6: Final answer
    x = 5,341.47

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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.