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Finding the Fourth Proportional to 696,521.30, 961,210.40 and 390,665.70

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Solution

The fourth proportional to 696,521.30, 961,210.40 and 390,665.70 is: 539,124.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    696,521.30 : 961,210.40 = 390,665.70 : x
  2. Step 2: Convert to fraction form
    696,521.30/961,210.40 = 390,665.70/x
  3. Step 3: Cross multiply
    696,521.30x = 961,210.40 × 390,665.70
  4. Step 4: Simplify right side
    696,521.30x = 375,511,931,809.95
  5. Step 5: Solve for x
    x = 375,511,931,809.95/696,521.30
  6. Step 6: Final answer
    x = 539,124.84

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Double scale
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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.