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Finding the Fourth Proportional to 717,178.89, 989,709.21 and 390,495.77

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Solution

The fourth proportional to 717,178.89, 989,709.21 and 390,495.77 is: 538,885.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,178.89 : 989,709.21 = 390,495.77 : x
  2. Step 2: Convert to fraction form
    717,178.89/989,709.21 = 390,495.77/x
  3. Step 3: Cross multiply
    717,178.89x = 989,709.21 × 390,495.77
  4. Step 4: Simplify right side
    717,178.89x = 386,477,260,035.04
  5. Step 5: Solve for x
    x = 386,477,260,035.04/717,178.89
  6. Step 6: Final answer
    x = 538,885.44

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.