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Finding the Fourth Proportional to 390,868.30, 528,086.93 and 390,868.30

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Solution

The fourth proportional to 390,868.30, 528,086.93 and 390,868.30 is: 528,086.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,868.30 : 528,086.93 = 390,868.30 : x
  2. Step 2: Convert to fraction form
    390,868.30/528,086.93 = 390,868.30/x
  3. Step 3: Cross multiply
    390,868.30x = 528,086.93 × 390,868.30
  4. Step 4: Simplify right side
    390,868.30x = 206,412,440,581.32
  5. Step 5: Solve for x
    x = 206,412,440,581.32/390,868.30
  6. Step 6: Final answer
    x = 528,086.93

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1.5x scale

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.