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Finding the Fourth Proportional to 390,874.80, 528,095.70 and 390,874.80

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Solution

The fourth proportional to 390,874.80, 528,095.70 and 390,874.80 is: 528,095.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,874.80 : 528,095.70 = 390,874.80 : x
  2. Step 2: Convert to fraction form
    390,874.80/528,095.70 = 390,874.80/x
  3. Step 3: Cross multiply
    390,874.80x = 528,095.70 × 390,874.80
  4. Step 4: Simplify right side
    390,874.80x = 206,419,301,118.36
  5. Step 5: Solve for x
    x = 206,419,301,118.36/390,874.80
  6. Step 6: Final answer
    x = 528,095.70

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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.