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Finding the Fourth Proportional to 390,300.30, 538,607.40 and 220,530.78

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Solution

The fourth proportional to 390,300.30, 538,607.40 and 220,530.78 is: 304,328.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,300.30 : 538,607.40 = 220,530.78 : x
  2. Step 2: Convert to fraction form
    390,300.30/538,607.40 = 220,530.78/x
  3. Step 3: Cross multiply
    390,300.30x = 538,607.40 × 220,530.78
  4. Step 4: Simplify right side
    390,300.30x = 118,779,510,035.77
  5. Step 5: Solve for x
    x = 118,779,510,035.77/390,300.30
  6. Step 6: Final answer
    x = 304,328.51

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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.