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Finding the Fourth Proportional to 390,021.80, 547,211.50 and 390,021.80

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Solution

The fourth proportional to 390,021.80, 547,211.50 and 390,021.80 is: 547,211.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,021.80 : 547,211.50 = 390,021.80 : x
  2. Step 2: Convert to fraction form
    390,021.80/547,211.50 = 390,021.80/x
  3. Step 3: Cross multiply
    390,021.80x = 547,211.50 × 390,021.80
  4. Step 4: Simplify right side
    390,021.80x = 213,424,414,210.70
  5. Step 5: Solve for x
    x = 213,424,414,210.70/390,021.80
  6. Step 6: Final answer
    x = 547,211.50

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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.