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Finding the Fourth Proportional to 710,928.96, 981,079.74 and 388,639.32

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Solution

The fourth proportional to 710,928.96, 981,079.74 and 388,639.32 is: 536,321.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    710,928.96 : 981,079.74 = 388,639.32 : x
  2. Step 2: Convert to fraction form
    710,928.96/981,079.74 = 388,639.32/x
  3. Step 3: Cross multiply
    710,928.96x = 981,079.74 × 388,639.32
  4. Step 4: Simplify right side
    710,928.96x = 381,286,163,019.38
  5. Step 5: Solve for x
    x = 381,286,163,019.38/710,928.96
  6. Step 6: Final answer
    x = 536,321.05

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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.