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Finding the Fourth Proportional to 715,812.47, 987,762.47 and 421,415.45

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Solution

The fourth proportional to 715,812.47, 987,762.47 and 421,415.45 is: 581,518.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,812.47 : 987,762.47 = 421,415.45 : x
  2. Step 2: Convert to fraction form
    715,812.47/987,762.47 = 421,415.45/x
  3. Step 3: Cross multiply
    715,812.47x = 987,762.47 × 421,415.45
  4. Step 4: Simplify right side
    715,812.47x = 416,258,358,742.27
  5. Step 5: Solve for x
    x = 416,258,358,742.27/715,812.47
  6. Step 6: Final answer
    x = 581,518.73

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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.