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Finding the Fourth Proportional to 661,516.86, 912,961.06 and 389,670.32

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Solution

The fourth proportional to 661,516.86, 912,961.06 and 389,670.32 is: 537,784.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,516.86 : 912,961.06 = 389,670.32 : x
  2. Step 2: Convert to fraction form
    661,516.86/912,961.06 = 389,670.32/x
  3. Step 3: Cross multiply
    661,516.86x = 912,961.06 × 389,670.32
  4. Step 4: Simplify right side
    661,516.86x = 355,753,828,397.74
  5. Step 5: Solve for x
    x = 355,753,828,397.74/661,516.86
  6. Step 6: Final answer
    x = 537,784.98

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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.