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Finding the Fourth Proportional to 415,018.55, 623,111.03 and 257,554.55

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Solution

The fourth proportional to 415,018.55, 623,111.03 and 257,554.55 is: 386,693.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    415,018.55 : 623,111.03 = 257,554.55 : x
  2. Step 2: Convert to fraction form
    415,018.55/623,111.03 = 257,554.55/x
  3. Step 3: Cross multiply
    415,018.55x = 623,111.03 × 257,554.55
  4. Step 4: Simplify right side
    415,018.55x = 160,485,079,643.91
  5. Step 5: Solve for x
    x = 160,485,079,643.91/415,018.55
  6. Step 6: Final answer
    x = 386,693.75

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1.5x scale

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.