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Finding the Fourth Proportional to 712,490, 983,242.72 and 486,130.64

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Solution

The fourth proportional to 712,490, 983,242.72 and 486,130.64 is: 670,864.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,490 : 983,242.72 = 486,130.64 : x
  2. Step 2: Convert to fraction form
    712,490/983,242.72 = 486,130.64/x
  3. Step 3: Cross multiply
    712,490x = 983,242.72 × 486,130.64
  4. Step 4: Simplify right side
    712,490x = 477,984,412,748.94
  5. Step 5: Solve for x
    x = 477,984,412,748.94/712,490
  6. Step 6: Final answer
    x = 670,864.73

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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.