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Finding the Fourth Proportional to 390,130.80, 585,196.20 and 363,886.80

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Solution

The fourth proportional to 390,130.80, 585,196.20 and 363,886.80 is: 545,830.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,130.80 : 585,196.20 = 363,886.80 : x
  2. Step 2: Convert to fraction form
    390,130.80/585,196.20 = 363,886.80/x
  3. Step 3: Cross multiply
    390,130.80x = 585,196.20 × 363,886.80
  4. Step 4: Simplify right side
    390,130.80x = 212,945,172,590.16
  5. Step 5: Solve for x
    x = 212,945,172,590.16/390,130.80
  6. Step 6: Final answer
    x = 545,830.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.