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Finding the Fourth Proportional to 978,128.20, 1,370,312.60 and 978,128.20

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Solution

The fourth proportional to 978,128.20, 1,370,312.60 and 978,128.20 is: 1,370,312.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,128.20 : 1,370,312.60 = 978,128.20 : x
  2. Step 2: Convert to fraction form
    978,128.20/1,370,312.60 = 978,128.20/x
  3. Step 3: Cross multiply
    978,128.20x = 1,370,312.60 × 978,128.20
  4. Step 4: Simplify right side
    978,128.20x = 1,340,341,396,875.32
  5. Step 5: Solve for x
    x = 1,340,341,396,875.32/978,128.20
  6. Step 6: Final answer
    x = 1,370,312.60

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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.