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Finding the Fourth Proportional to 714,645.12, 986,238 and 392,368.80

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Solution

The fourth proportional to 714,645.12, 986,238 and 392,368.80 is: 541,484.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    714,645.12 : 986,238 = 392,368.80 : x
  2. Step 2: Convert to fraction form
    714,645.12/986,238 = 392,368.80/x
  3. Step 3: Cross multiply
    714,645.12x = 986,238 × 392,368.80
  4. Step 4: Simplify right side
    714,645.12x = 386,969,020,574.40
  5. Step 5: Solve for x
    x = 386,969,020,574.40/714,645.12
  6. Step 6: Final answer
    x = 541,484.17

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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.