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Finding the Fourth Proportional to 656,393,300.64, 905,825,484 and 354,978,612.17

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Solution

The fourth proportional to 656,393,300.64, 905,825,484 and 354,978,612.17 is: 489,871,960.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    656,393,300.64 : 905,825,484 = 354,978,612.17 : x
  2. Step 2: Convert to fraction form
    656,393,300.64/905,825,484 = 354,978,612.17/x
  3. Step 3: Cross multiply
    656,393,300.64x = 905,825,484 × 354,978,612.17
  4. Step 4: Simplify right side
    656,393,300.64x = 321,548,673,174,009,408
  5. Step 5: Solve for x
    x = 321,548,673,174,009,408/656,393,300.64
  6. Step 6: Final answer
    x = 489,871,960.70

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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.