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Finding the Fourth Proportional to 716,838.18, 989,236.64 and 390,153.54

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Solution

The fourth proportional to 716,838.18, 989,236.64 and 390,153.54 is: 538,411.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    716,838.18 : 989,236.64 = 390,153.54 : x
  2. Step 2: Convert to fraction form
    716,838.18/989,236.64 = 390,153.54/x
  3. Step 3: Cross multiply
    716,838.18x = 989,236.64 × 390,153.54
  4. Step 4: Simplify right side
    716,838.18x = 385,954,172,796.38
  5. Step 5: Solve for x
    x = 385,954,172,796.38/716,838.18
  6. Step 6: Final answer
    x = 538,411.85

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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.