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Finding the Fourth Proportional to 719,420.40, 992,800.34 and 397,130.72

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Solution

The fourth proportional to 719,420.40, 992,800.34 and 397,130.72 is: 548,040.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    719,420.40 : 992,800.34 = 397,130.72 : x
  2. Step 2: Convert to fraction form
    719,420.40/992,800.34 = 397,130.72/x
  3. Step 3: Cross multiply
    719,420.40x = 992,800.34 × 397,130.72
  4. Step 4: Simplify right side
    719,420.40x = 394,271,506,890.79
  5. Step 5: Solve for x
    x = 394,271,506,890.79/719,420.40
  6. Step 6: Final answer
    x = 548,040.49

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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.