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Finding the Fourth Proportional to 678,762.70, 936,721.96 and 388,465.39

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Solution

The fourth proportional to 678,762.70, 936,721.96 and 388,465.39 is: 536,099.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,762.70 : 936,721.96 = 388,465.39 : x
  2. Step 2: Convert to fraction form
    678,762.70/936,721.96 = 388,465.39/x
  3. Step 3: Cross multiply
    678,762.70x = 936,721.96 × 388,465.39
  4. Step 4: Simplify right side
    678,762.70x = 363,884,058,200.00
  5. Step 5: Solve for x
    x = 363,884,058,200.00/678,762.70
  6. Step 6: Final answer
    x = 536,099.08

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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.