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Finding the Fourth Proportional to 9,870.66, 13,621.28 and 5,394.30

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Solution

The fourth proportional to 9,870.66, 13,621.28 and 5,394.30 is: 7,444.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,870.66 : 13,621.28 = 5,394.30 : x
  2. Step 2: Convert to fraction form
    9,870.66/13,621.28 = 5,394.30/x
  3. Step 3: Cross multiply
    9,870.66x = 13,621.28 × 5,394.30
  4. Step 4: Simplify right side
    9,870.66x = 73,477,270.70
  5. Step 5: Solve for x
    x = 73,477,270.70/9,870.66
  6. Step 6: Final answer
    x = 7,444.01

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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.