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Finding the Fourth Proportional to 389,989.99, 537,665.74 and 309,683.35

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Solution

The fourth proportional to 389,989.99, 537,665.74 and 309,683.35 is: 426,949.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,989.99 : 537,665.74 = 309,683.35 : x
  2. Step 2: Convert to fraction form
    389,989.99/537,665.74 = 309,683.35/x
  3. Step 3: Cross multiply
    389,989.99x = 537,665.74 × 309,683.35
  4. Step 4: Simplify right side
    389,989.99x = 166,506,127,543.43
  5. Step 5: Solve for x
    x = 166,506,127,543.43/389,989.99
  6. Step 6: Final answer
    x = 426,949.75

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1.5x scale

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.