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Finding the Fourth Proportional to 621,831.40, 872,775.80 and 621,831.40

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Solution

The fourth proportional to 621,831.40, 872,775.80 and 621,831.40 is: 872,775.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,831.40 : 872,775.80 = 621,831.40 : x
  2. Step 2: Convert to fraction form
    621,831.40/872,775.80 = 621,831.40/x
  3. Step 3: Cross multiply
    621,831.40x = 872,775.80 × 621,831.40
  4. Step 4: Simplify right side
    621,831.40x = 542,719,397,600.12
  5. Step 5: Solve for x
    x = 542,719,397,600.12/621,831.40
  6. Step 6: Final answer
    x = 872,775.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.