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Finding the Fourth Proportional to 978,055.20, 1,370,210.40 and 978,055.20

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Solution

The fourth proportional to 978,055.20, 1,370,210.40 and 978,055.20 is: 1,370,210.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,055.20 : 1,370,210.40 = 978,055.20 : x
  2. Step 2: Convert to fraction form
    978,055.20/1,370,210.40 = 978,055.20/x
  3. Step 3: Cross multiply
    978,055.20x = 1,370,210.40 × 978,055.20
  4. Step 4: Simplify right side
    978,055.20x = 1,340,141,406,814.08
  5. Step 5: Solve for x
    x = 1,340,141,406,814.08/978,055.20
  6. Step 6: Final answer
    x = 1,370,210.40

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1.5x scale

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.