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Finding the Fourth Proportional to 346,965, 478,811.70 and 187,989

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Solution

The fourth proportional to 346,965, 478,811.70 and 187,989 is: 259,424.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    346,965 : 478,811.70 = 187,989 : x
  2. Step 2: Convert to fraction form
    346,965/478,811.70 = 187,989/x
  3. Step 3: Cross multiply
    346,965x = 478,811.70 × 187,989
  4. Step 4: Simplify right side
    346,965x = 90,011,332,671.30
  5. Step 5: Solve for x
    x = 90,011,332,671.30/346,965
  6. Step 6: Final answer
    x = 259,424.82

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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.