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Finding the Fourth Proportional to 717,956.21, 990,779.58 and 395,666.30

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Solution

The fourth proportional to 717,956.21, 990,779.58 and 395,666.30 is: 546,019.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,956.21 : 990,779.58 = 395,666.30 : x
  2. Step 2: Convert to fraction form
    717,956.21/990,779.58 = 395,666.30/x
  3. Step 3: Cross multiply
    717,956.21x = 990,779.58 × 395,666.30
  4. Step 4: Simplify right side
    717,956.21x = 392,018,093,011.10
  5. Step 5: Solve for x
    x = 392,018,093,011.10/717,956.21
  6. Step 6: Final answer
    x = 546,019.51

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.