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Finding the Fourth Proportional to 634,128.32, 875,187.20 and 392,488.80

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Solution

The fourth proportional to 634,128.32, 875,187.20 and 392,488.80 is: 541,690.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    634,128.32 : 875,187.20 = 392,488.80 : x
  2. Step 2: Convert to fraction form
    634,128.32/875,187.20 = 392,488.80/x
  3. Step 3: Cross multiply
    634,128.32x = 875,187.20 × 392,488.80
  4. Step 4: Simplify right side
    634,128.32x = 343,501,173,903.36
  5. Step 5: Solve for x
    x = 343,501,173,903.36/634,128.32
  6. Step 6: Final answer
    x = 541,690.32

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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.