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Finding the Fourth Proportional to 528,047.40, 790,688.70 and 387,042.60

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Solution

The fourth proportional to 528,047.40, 790,688.70 and 387,042.60 is: 579,550.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    528,047.40 : 790,688.70 = 387,042.60 : x
  2. Step 2: Convert to fraction form
    528,047.40/790,688.70 = 387,042.60/x
  3. Step 3: Cross multiply
    528,047.40x = 790,688.70 × 387,042.60
  4. Step 4: Simplify right side
    528,047.40x = 306,030,210,238.62
  5. Step 5: Solve for x
    x = 306,030,210,238.62/528,047.40
  6. Step 6: Final answer
    x = 579,550.64

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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.