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Finding the Fourth Proportional to 678,870.42, 936,737.02 and 392,335.16

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Solution

The fourth proportional to 678,870.42, 936,737.02 and 392,335.16 is: 541,362.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,870.42 : 936,737.02 = 392,335.16 : x
  2. Step 2: Convert to fraction form
    678,870.42/936,737.02 = 392,335.16/x
  3. Step 3: Cross multiply
    678,870.42x = 936,737.02 × 392,335.16
  4. Step 4: Simplify right side
    678,870.42x = 367,514,868,619.62
  5. Step 5: Solve for x
    x = 367,514,868,619.62/678,870.42
  6. Step 6: Final answer
    x = 541,362.32

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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.