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Finding the Fourth Proportional to 390,871.80, 528,091.65 and 390,871.80

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Solution

The fourth proportional to 390,871.80, 528,091.65 and 390,871.80 is: 528,091.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,871.80 : 528,091.65 = 390,871.80 : x
  2. Step 2: Convert to fraction form
    390,871.80/528,091.65 = 390,871.80/x
  3. Step 3: Cross multiply
    390,871.80x = 528,091.65 × 390,871.80
  4. Step 4: Simplify right side
    390,871.80x = 206,416,133,800.47
  5. Step 5: Solve for x
    x = 206,416,133,800.47/390,871.80
  6. Step 6: Final answer
    x = 528,091.65

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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.