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Finding the Fourth Proportional to 672,912.80, 928,640.40 and 386,490.32

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Solution

The fourth proportional to 672,912.80, 928,640.40 and 386,490.32 is: 533,368.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    672,912.80 : 928,640.40 = 386,490.32 : x
  2. Step 2: Convert to fraction form
    672,912.80/928,640.40 = 386,490.32/x
  3. Step 3: Cross multiply
    672,912.80x = 928,640.40 × 386,490.32
  4. Step 4: Simplify right side
    672,912.80x = 358,910,525,360.93
  5. Step 5: Solve for x
    x = 358,910,525,360.93/672,912.80
  6. Step 6: Final answer
    x = 533,368.55

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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.