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Finding the Fourth Proportional to 713,415.84, 984,513.78 and 391,128.18

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Solution

The fourth proportional to 713,415.84, 984,513.78 and 391,128.18 is: 539,756.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    713,415.84 : 984,513.78 = 391,128.18 : x
  2. Step 2: Convert to fraction form
    713,415.84/984,513.78 = 391,128.18/x
  3. Step 3: Cross multiply
    713,415.84x = 984,513.78 × 391,128.18
  4. Step 4: Simplify right side
    713,415.84x = 385,071,082,956.32
  5. Step 5: Solve for x
    x = 385,071,082,956.32/713,415.84
  6. Step 6: Final answer
    x = 539,756.84

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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.