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Finding the Fourth Proportional to 390,043.05, 547,241.25 and 390,043.05

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Solution

The fourth proportional to 390,043.05, 547,241.25 and 390,043.05 is: 547,241.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,043.05 : 547,241.25 = 390,043.05 : x
  2. Step 2: Convert to fraction form
    390,043.05/547,241.25 = 390,043.05/x
  3. Step 3: Cross multiply
    390,043.05x = 547,241.25 × 390,043.05
  4. Step 4: Simplify right side
    390,043.05x = 213,447,646,235.81
  5. Step 5: Solve for x
    x = 213,447,646,235.81/390,043.05
  6. Step 6: Final answer
    x = 547,241.25

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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.