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Finding the Fourth Proportional to 389,303.70, 583,955.55 and 139,953.30

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Solution

The fourth proportional to 389,303.70, 583,955.55 and 139,953.30 is: 209,929.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,303.70 : 583,955.55 = 139,953.30 : x
  2. Step 2: Convert to fraction form
    389,303.70/583,955.55 = 139,953.30/x
  3. Step 3: Cross multiply
    389,303.70x = 583,955.55 × 139,953.30
  4. Step 4: Simplify right side
    389,303.70x = 81,726,506,275.82
  5. Step 5: Solve for x
    x = 81,726,506,275.82/389,303.70
  6. Step 6: Final answer
    x = 209,929.95

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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.