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Finding the Fourth Proportional to 651,669.40, 978,378.90 and 416,056.60

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Solution

The fourth proportional to 651,669.40, 978,378.90 and 416,056.60 is: 624,643.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    651,669.40 : 978,378.90 = 416,056.60 : x
  2. Step 2: Convert to fraction form
    651,669.40/978,378.90 = 416,056.60/x
  3. Step 3: Cross multiply
    651,669.40x = 978,378.90 × 416,056.60
  4. Step 4: Simplify right side
    651,669.40x = 407,060,998,645.74
  5. Step 5: Solve for x
    x = 407,060,998,645.74/651,669.40
  6. Step 6: Final answer
    x = 624,643.41

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.