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Finding the Fourth Proportional to 978,118.20, 1,370,298.60 and 978,118.20

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Solution

The fourth proportional to 978,118.20, 1,370,298.60 and 978,118.20 is: 1,370,298.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,118.20 : 1,370,298.60 = 978,118.20 : x
  2. Step 2: Convert to fraction form
    978,118.20/1,370,298.60 = 978,118.20/x
  3. Step 3: Cross multiply
    978,118.20x = 1,370,298.60 × 978,118.20
  4. Step 4: Simplify right side
    978,118.20x = 1,340,314,000,094.52
  5. Step 5: Solve for x
    x = 1,340,314,000,094.52/978,118.20
  6. Step 6: Final answer
    x = 1,370,298.60

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.