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Finding the Fourth Proportional to 715,640.80, 1,071,128.40 and 715,640.80

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Solution

The fourth proportional to 715,640.80, 1,071,128.40 and 715,640.80 is: 1,071,128.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,640.80 : 1,071,128.40 = 715,640.80 : x
  2. Step 2: Convert to fraction form
    715,640.80/1,071,128.40 = 715,640.80/x
  3. Step 3: Cross multiply
    715,640.80x = 1,071,128.40 × 715,640.80
  4. Step 4: Simplify right side
    715,640.80x = 766,543,185,078.72
  5. Step 5: Solve for x
    x = 766,543,185,078.72/715,640.80
  6. Step 6: Final answer
    x = 1,071,128.40

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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.