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Finding the Fourth Proportional to 390,081.40, 547,688.60 and 390,081.40

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Solution

The fourth proportional to 390,081.40, 547,688.60 and 390,081.40 is: 547,688.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,081.40 : 547,688.60 = 390,081.40 : x
  2. Step 2: Convert to fraction form
    390,081.40/547,688.60 = 390,081.40/x
  3. Step 3: Cross multiply
    390,081.40x = 547,688.60 × 390,081.40
  4. Step 4: Simplify right side
    390,081.40x = 213,643,135,852.04
  5. Step 5: Solve for x
    x = 213,643,135,852.04/390,081.40
  6. Step 6: Final answer
    x = 547,688.60

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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.