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Finding the Fourth Proportional to 390,866.80, 528,084.90 and 390,866.80

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Solution

The fourth proportional to 390,866.80, 528,084.90 and 390,866.80 is: 528,084.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,866.80 : 528,084.90 = 390,866.80 : x
  2. Step 2: Convert to fraction form
    390,866.80/528,084.90 = 390,866.80/x
  3. Step 3: Cross multiply
    390,866.80x = 528,084.90 × 390,866.80
  4. Step 4: Simplify right side
    390,866.80x = 206,410,854,991.32
  5. Step 5: Solve for x
    x = 206,410,854,991.32/390,866.80
  6. Step 6: Final answer
    x = 528,084.90

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Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.