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Finding the Fourth Proportional to 1,209,835.60, 1,812,679.80 and 788,894.80

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Solution

The fourth proportional to 1,209,835.60, 1,812,679.80 and 788,894.80 is: 1,181,990.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209,835.60 : 1,812,679.80 = 788,894.80 : x
  2. Step 2: Convert to fraction form
    1,209,835.60/1,812,679.80 = 788,894.80/x
  3. Step 3: Cross multiply
    1,209,835.60x = 1,812,679.80 × 788,894.80
  4. Step 4: Simplify right side
    1,209,835.60x = 1,430,013,668,285.04
  5. Step 5: Solve for x
    x = 1,430,013,668,285.04/1,209,835.60
  6. Step 6: Final answer
    x = 1,181,990.07

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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.