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Finding the Fourth Proportional to 390,865.30, 528,082.88 and 390,865.30

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Solution

The fourth proportional to 390,865.30, 528,082.88 and 390,865.30 is: 528,082.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,865.30 : 528,082.88 = 390,865.30 : x
  2. Step 2: Convert to fraction form
    390,865.30/528,082.88 = 390,865.30/x
  3. Step 3: Cross multiply
    390,865.30x = 528,082.88 × 390,865.30
  4. Step 4: Simplify right side
    390,865.30x = 206,409,271,361.74
  5. Step 5: Solve for x
    x = 206,409,271,361.74/390,865.30
  6. Step 6: Final answer
    x = 528,082.88

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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.