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Finding the Fourth Proportional to 390,862.80, 528,079.50 and 390,862.80

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Solution

The fourth proportional to 390,862.80, 528,079.50 and 390,862.80 is: 528,079.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,862.80 : 528,079.50 = 390,862.80 : x
  2. Step 2: Convert to fraction form
    390,862.80/528,079.50 = 390,862.80/x
  3. Step 3: Cross multiply
    390,862.80x = 528,079.50 × 390,862.80
  4. Step 4: Simplify right side
    390,862.80x = 206,406,631,992.60
  5. Step 5: Solve for x
    x = 206,406,631,992.60/390,862.80
  6. Step 6: Final answer
    x = 528,079.50

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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.