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Finding the Fourth Proportional to 315,738.40, 473,434.80 and 128,538.40

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Solution

The fourth proportional to 315,738.40, 473,434.80 and 128,538.40 is: 192,737.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,738.40 : 473,434.80 = 128,538.40 : x
  2. Step 2: Convert to fraction form
    315,738.40/473,434.80 = 128,538.40/x
  3. Step 3: Cross multiply
    315,738.40x = 473,434.80 × 128,538.40
  4. Step 4: Simplify right side
    315,738.40x = 60,854,551,696.32
  5. Step 5: Solve for x
    x = 60,854,551,696.32/315,738.40
  6. Step 6: Final answer
    x = 192,737.25

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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.